Patent US4327015A successfully refreshed from Google Patents.
US4327015A
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Flame resistant, transparent polycarbonates comprising bisulfite adducts
Assignee: Bayer AG
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Filing: 1981-05-11
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Granted: 1982-04-27
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Expires: 2001-05-11
Abstract
Abstract The invention is directed to flame-resistant, transparent aromatic polycarbonate compositions comprising polycarbonate resin and an additive amount of a member selected from the group consisting of aldehyde-bisulphite adducts and ketone-bisulphite adducts.
Inventors
- 👤 Frank Druschke
- 👤 Dieter Margotte
- 👤 Wolfgang Cohnen
- 👤 Karsten Idel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:11
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/36; C08K5/41
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
35 words
Polycarbonates based on diphenols, characterized in that they comprise from 0.001 to 0.4% by weight, relative to the weight of polycarbonate, of an additive selected from the group consisting of aldehyde-bisulphite adducts and ketone-bisulphite adducts.
Claim 2
Dependent Claim
35 words
Polycarbonates based on diphenols, characterized in that they comprise from 0.001 to 0.4% by weight, relative to the weight of polycarbonate, of an additive selected from the group consisting of aldehyde-bisulphite adducts and ketone-bisulphite adducts.
Claim 3
Dependent Claim
25 words
The polycarbonates of claim 1, characterized in that they comprise from 0.01 to 0.25% by weight, relative to the weight of polycarbonate, of said additive.
Claim 4
Dependent Claim
25 words
The polycarbonates of claim 2, characterized in that they comprise from 0.05 to 0.15% by weight, relative to the weight of polycarbonate, of said additive.
Claim 5
Dependent Claim
73 words
The polycarbonates of claim 1, characterized in that they comprise an aldehyde- or ketone-bisulphite adduct of the formula (I) ##STR11## wherein Me is an alkali metal and n is 1, or Me is an alkaline earth metal and n is 2, x is 1 to 4 and R denotes H, alkyl, cycloalkyl, alkenyl, cycloalkenyl, aryl or aralkyl radical, and wherein R' is R or a polyfunctional radical of a polyketone or a polyaldehyde.
Claim 6
Dependent Claim
46 words
The polycarbonates of claim 1, characterized in that they contain a ketone-bisulphite adduct of the formula (II) ##STR12## wherein Me is an alkali metal and n is 1, or Me is an alkaline earth metal and n is 2 and y is from 4 to 10.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-04-26 | 1985-10-26 | 1986-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-04-26 | 1989-10-26 | 1990-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-04-26 | 1993-10-26 | 1994-04-27 | $7700.00 | Window Closed / Lapsed |